US9525328B2 - Rotating electric machine, in particular double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA - Google Patents

Rotating electric machine, in particular double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA Download PDF

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Publication number
US9525328B2
US9525328B2 US14/306,746 US201414306746A US9525328B2 US 9525328 B2 US9525328 B2 US 9525328B2 US 201414306746 A US201414306746 A US 201414306746A US 9525328 B2 US9525328 B2 US 9525328B2
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United States
Prior art keywords
connectors
rotating electric
electric machine
rotor
auxiliary rim
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US14/306,746
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US20140292136A1 (en
Inventor
Ricardo Naoki Okai
Alexander Schwery
Hanspeter WALSER
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GE Renewable Technologies SAS
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Alstom Renewable Technologies Wind BV
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Assigned to ALSTOM TECHNOLOGY LTD reassignment ALSTOM TECHNOLOGY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OKAI, RICARDO NAOKI, SCHWERY, ALEXANDER, WALSER, HANSPETER
Publication of US20140292136A1 publication Critical patent/US20140292136A1/en
Assigned to ALSTOM RENEWABLE TECHNOLOGIES reassignment ALSTOM RENEWABLE TECHNOLOGIES CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME PREVIOUSLY RECORDED AT REEL: 033759 FRAME: 0855. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: OKAI, RICARDO NAOKI, SCHWERY, ALEXANDER, WALSER, HANSPETER
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Assigned to GE RENEWABLE TECHNOLOGIES reassignment GE RENEWABLE TECHNOLOGIES CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ALSTOM RENEWABLE TECHNOLOGIES
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H02K13/003—Structural associations of slip-rings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/22—Asynchronous induction motors having rotors with windings connected to slip-rings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H02K3/51—Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only

Definitions

  • the present invention relates to the field of the generation of electrical energy. It relates to a rotating electric machine, in particular a double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA, in accordance with the preamble of claim 1 .
  • Double-fed asynchronous machines with a power range of from 20 MVA to 500 MVA can be used for variable-speed energy production. These machines are characterized by a distributed three-phase winding on the rotor.
  • the rotor winding comprises individual bars which are embedded in slots in the rotor laminate stack. The bars are interconnected to form a winding in the end winding.
  • the currents are fed via at least three slip rings, which are fastened on the rotor shaft at the end of the machine.
  • FIG. 1 A detail of such a machine is shown in FIG. 1 in a very simplified form.
  • the asynchronous machine 10 illustrated in FIG. 1 has a machine axis 19 .
  • a central core 11 comprising a shaft 11 a on which the slip rings 17 are arranged is rotatable about this axis 19 .
  • the rotor laminated core 12 is arranged around the central core 11 , with an auxiliary rim 13 adjoining said rotor laminated core beneath an end winding 14 of the rotor winding.
  • the rotor laminated core 12 is surrounded concentrically by a stator laminated core 15 , in which a stator winding is accommodated which protrudes outwards at the end of the core 15 with a stator end winding 16 .
  • the three phases of the rotor winding need to be connected to the slip rings 17 at the end of the shaft 11 a .
  • conductors (not illustrated) are accommodated in the shaft 11 a , which conductors are connected firstly to the slip rings 17 and secondly to the end windings 14 at the level of the ends of the end windings.
  • the connectors 18 (indicated by dashed lines in FIG. 1 ) passing at right angles to the shaft need to be insulated for the rotor test voltage.
  • the connectors 18 carry the rated rotor current and in this case should not exceed the required limit temperature.
  • the system of connectors 18 needs to be sufficiently flexible in the axial direction (at the connection point of the winding) and in the radial direction to enable the thermal expansion of the winding in the axial direction and the expansion of the rotor core in the radial direction to be accommodated. Finally, the connectors 18 need to be safeguarded with respect to the high centrifugal forces.
  • An object of the invention therefore consists in providing a rotating electric machine of the type mentioned at the outset which satisfies the abovementioned demands.
  • the object is achieved by a rotating electric machine of the type mentioned in claim 1 .
  • the rotating electric machine in particular double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA, comprises a rotor, which rotates about a machine axis, is surrounded concentrically by a stator and comprises a rotor laminated core and a shaft, which rotor laminated core bears a rotor winding which is arranged further outwards and which is connected via connectors to slip rings arranged further inwards at the end of the shaft.
  • the invention is characterized by the fact that the connectors have mechanical connectors which run at right angles to the shaft, for absorbing forces occurring as a result of the centrifugal acceleration, and which are firstly connected to a rotor end winding of the rotor winding and are secondly supported on an auxiliary rim on the rotor laminated core.
  • One configuration of the machine according to the invention is characterized by the fact that the mechanical connectors are connected to the rotor end winding of the rotor winding via end winding connections, and that they are supported on the auxiliary rim via an extended auxiliary rim, which extends the auxiliary rim in the axial direction, preferably consists of layered laminations and forms a closed ring.
  • Another configuration is characterized by the fact that the mechanical connectors are at the same axial height as the end winding connections. As a result, bending stresses in the connectors are safely avoided.
  • a further configuration of the invention is characterized by the fact that the mechanical connectors cross through the extended auxiliary rim in the radial direction, said extended auxiliary rim being connected to the auxiliary rim via bolts, in order to avoid bending stresses in the mechanical connectors.
  • the mechanical connectors consist of an electrically conductive material which can be subjected to a high mechanical load, in particular of a steel.
  • the mechanical connectors can also be electrically connected to the rotor end winding or the end winding connections.
  • the mechanical connectors are electrically insulated by insulation surrounding them and if the centrifugal forces which are absorbed by the mechanical connectors are transmitted via ends, arranged at right angles, of the connectors and via insulation blocks arranged on the inner side of the auxiliary rim or of the extended auxiliary rim onto the auxiliary rim or extended auxiliary rim.
  • Another configuration of the invention is characterized by the fact that additional electrical connectors are provided for the actual transmission of current, which electrical connectors are connected electrically in parallel with the mechanical connectors.
  • the electrical connectors pass outside the auxiliary rim or extended auxiliary rim for improved cooling.
  • the electrical connectors can consist of materials which can be subjected to a lower mechanical load but have good electrical conductivity, in particular copper.
  • a further configuration is characterized by the fact that the electrical connectors are bent back at right angles on the inner side in order to transmit the centrifugal forces arising, via insulation blocks, onto the inner side of the auxiliary rim or extended auxiliary rim, and by the fact that the electrical connectors are secured in the axial direction by outer terminating plates.
  • a further configuration of the invention is characterized by the fact that the electrical and mechanical connectors are electrically connected by connector connections, and by the fact that the connector connections are electrically connected to flexible transition pieces, which produce the contact with shaft feeders arranged on the shaft.
  • the flexible transition pieces are U-shaped.
  • the flexible transition pieces prefferably be constructed from individual laminations.
  • the transition pieces can also consist of a material which cannot be subjected to a high mechanical load but has good electrical conductivity, in particular copper.
  • connectors are provided on the circumference, which connectors do not have either a mechanical or an electrical function.
  • FIG. 1 shows a detail of an asynchronous machine in a very simplified form
  • FIG. 2 shows, in a longitudinal section, the parallel arrangement of mechanical and electrical connectors in accordance with an exemplary embodiment of the invention.
  • FIG. 3 shows the plan view in the axial direction of an arrangement as shown in FIG. 2 .
  • FIGS. 2 and 3 The main component parts of rotor feeders or connectors 18 in accordance with an exemplary embodiment of the invention are illustrated in FIGS. 2 and 3 .
  • the current is passed from the slip rings 17 through the shaft 11 a via shaft feeders 28 to connector connections 26 .
  • the actual connectors 18 a , 18 b produce the electrical contact between the connector connections 26 and the end winding connections 20 , which are ultimately connected to the rotor winding (rotor end winding 14 ).
  • the text which follows gives details of the function of the individual parts.
  • the end winding connections 20 produce the contact between the connectors 18 a , 18 b and the associated connection bars of the rotor winding; in this case they can be connected to a plurality of connectors 18 a , 18 b distributed over the circumference. They need to be configured, together with the connectors 18 a , 18 b , sufficiently flexibly so as to enable them to accommodate the axial thermal expansion (direction x in FIG. 2 ) of the winding.
  • the connectors 18 a , 18 b represent the actual heart of the present invention.
  • FIG. 2 shows the basic division into electrical connectors 18 a and mechanical connectors 18 b .
  • the task of the mechanical connectors 18 b is to absorb the forces of the end winding connections 20 which arise as a result of the centrifugal acceleration and to pass these forces on to the auxiliary rim 13 .
  • the auxiliary rim 13 is extended in the axial direction by an extended auxiliary rim 22 .
  • the mechanical connectors 18 b pass in the radial direction (direction r in FIG. 2 ) through the extended auxiliary rim 22 , which comprises layered laminations and therefore forms a closed ring, which is connected to the auxiliary rim 13 via bolts 23 .
  • the mechanical connectors 18 b are preferably located at the same axial height as the end winding connections 20 .
  • the mechanical connectors 18 b consist of a material which can be subjected to a high mechanical load and which can also be used as an electrical conductor, if required, such as steel, for example.
  • the mechanical connectors 18 b are also electrically connected to the end winding connections 20 and therefore contribute to the transmission of current, wherein this function is optional. If the mechanical connectors 18 b are in direct contact with the electrical connectors 18 a , they need to be insulated correspondingly. For this purpose, as shown in FIG. 2 , firstly insulation which surrounds the connectors 18 a , 18 b directly and secondly an insulation block 25 which is located on the inner circumference of the extended auxiliary rim 22 are used.
  • the centrifugal forces which are absorbed by the mechanical connectors 18 b are transmitted by said mechanical connectors onto the extended auxiliary rim 22 .
  • the force transmission takes place via the ends of the connectors 18 a , 18 b which are arranged in the form of a rectangle onto the insulation blocks 25 and therefore onto the inner side of the extended auxiliary rim 22 .
  • the electrical connectors 18 a do not have to absorb any additional forces, however, and can therefore consist of materials which can be subjected to a lower mechanical load but have good conductivity in comparison with the mechanical connectors 18 b , such as copper, for example.
  • the electrical connectors 18 a are bent back at right angles on the inner side in order to transmit the centrifugal forces arising via the insulation blocks 25 onto the inner side of the extended auxiliary rim 22 .
  • the electrical connectors 18 a are secured in the axial direction by outer terminating plates 24 .
  • the connectors 18 a , 18 b are electrically connected with the aid of the connector connections 26 ( FIG. 3 ) on the inner side of the extended auxiliary rim 22 .
  • the centrifugal forces arising in the connector connections 26 are taken up by the extended auxiliary rim 22 .
  • They are supported radially via further insulation blocks.
  • the connector connections 26 are electrically connected to flexible transition pieces 27 , which produce the contact with special shaft feeders 28 .
  • the shaft feeders 28 are connected to conductors (not illustrated) in the shaft 11 a and are mounted fixedly on the arms of the rotor star of the asynchronous machine. Since the layered rotor laminated core 12 can expand during operation, a flexible connection in the radial direction is required between the shaft feeders 28 and the connectors 18 a , 18 b . This task is performed by the flexible transition pieces 27 .
  • said transition pieces can be provided with a U-shaped construction, as indicated in FIG. 3 . If necessary, the flexible transition pieces 27 can also be constructed from individual laminations in order to achieve additional flexibility.
  • transition pieces 27 are not subjected to a high mechanical load since the shaft feeders 28 are borne by the rotor star arms, and the connector connections 26 are borne by the extended auxiliary rim 22 . They can therefore consist of a material which cannot be subjected to a high mechanical load but has good conductivity, such as copper, for example.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Windings For Motors And Generators (AREA)
  • Motor Or Generator Frames (AREA)
US14/306,746 2011-12-22 2014-06-17 Rotating electric machine, in particular double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA Active 2033-01-27 US9525328B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH02026/11A CH705931A1 (de) 2011-12-22 2011-12-22 Rotierende elektrische Maschine, insbesondere doppelt gespeiste Asynchronmaschine im Leistungsbereich zwischen 20 MVA und 500 MVA.
CH02026/11 2011-12-22
CH2026/11 2011-12-22
PCT/EP2012/076633 WO2013093000A1 (de) 2011-12-22 2012-12-21 Rotierende elektrische maschine, insbesondere doppelt gespeiste asynchronmaschine im leistungsbereich zwischen 20 mva und 500 mva

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/076633 Continuation WO2013093000A1 (de) 2011-12-22 2012-12-21 Rotierende elektrische maschine, insbesondere doppelt gespeiste asynchronmaschine im leistungsbereich zwischen 20 mva und 500 mva

Publications (2)

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US20140292136A1 US20140292136A1 (en) 2014-10-02
US9525328B2 true US9525328B2 (en) 2016-12-20

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US14/306,746 Active 2033-01-27 US9525328B2 (en) 2011-12-22 2014-06-17 Rotating electric machine, in particular double-fed asynchronous machine with a power range of between 20 MVA and 500 MVA

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Country Link
US (1) US9525328B2 (ja)
EP (1) EP2795767B1 (ja)
JP (1) JP5823061B2 (ja)
CN (1) CN104170217B (ja)
CA (1) CA2858282C (ja)
CH (1) CH705931A1 (ja)
ES (1) ES2749447T3 (ja)
PT (1) PT2795767T (ja)
WO (1) WO2013093000A1 (ja)

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Publication number Priority date Publication date Assignee Title
PL3176922T3 (pl) * 2015-12-03 2021-11-29 Linde Gmbh Wirnik do silnika pierścieniowego i silnik pierścieniowy
DE102017113695B3 (de) * 2017-06-21 2018-12-27 Carl Mahr Holding Gmbh Wippenloses Messsystem für ein Messgerät

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191014680A (en) * 1910-06-17 1911-06-15 Charles Algernon Parsons Improvements in Dynamo Electric Machinery.
GB191114680A (en) 1910-06-25 1911-10-05 Hippolyt Saurer Improvements in or relating to Perforating Machines for the Production of Jacquard Cards for Embroidery Machines.
US2001319A (en) 1932-04-28 1935-05-14 Aluminum Co Of America Cable
US3089048A (en) * 1960-06-03 1963-05-07 Gen Electric Winding support system for a dynamoelectric machine
US3445703A (en) * 1965-12-06 1969-05-20 Gen Electric Combined cast risers and involuted equalizers
JPS61104748A (ja) 1984-10-29 1986-05-23 Nisshin Flour Milling Co Ltd 高油脂含有食品顆粒
SU1617538A1 (ru) 1988-02-08 1990-12-30 Научно-исследовательский, проектно-конструкторский и технологический институт тяжелого электромашиностроения Харьковского завода "Электротяжмаш" им.В.И.Ленина Ротор электрической машины
DE19519127C1 (de) 1995-05-16 1996-09-12 Siemens Ag Dynamoelektrische Maschine mit bewickeltem Rotor
EP0736953A2 (de) 1995-04-08 1996-10-09 ABB Management AG Rotor einer elektrischen Maschine
US6020670A (en) * 1998-08-17 2000-02-01 General Electric Co. Connector support block for limiting deflection of a main lead connector in an electric machine
JP2000166159A (ja) 1998-11-27 2000-06-16 Kokusan Denki Co Ltd 電動機用固定子
JP2007104847A (ja) 2005-10-07 2007-04-19 Hitachi Ltd 回転電機及びその製作方法
CN101588104A (zh) 2008-05-20 2009-11-25 株式会社日立制作所 旋转电机
DE102009003798A1 (de) 2009-04-17 2010-10-21 Contitech Antriebssysteme Gmbh Kraftübertragungsriemen, insbesondere Keilriemen, und Verfahren zu dessen Herstellung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61104748U (ja) * 1984-12-17 1986-07-03
DE102009037989A1 (de) * 2009-08-20 2011-03-03 Alstom Technology Ltd. Elektrische Maschine mit Rotorwickelkopf

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB191014680A (en) * 1910-06-17 1911-06-15 Charles Algernon Parsons Improvements in Dynamo Electric Machinery.
GB191114680A (en) 1910-06-25 1911-10-05 Hippolyt Saurer Improvements in or relating to Perforating Machines for the Production of Jacquard Cards for Embroidery Machines.
US2001319A (en) 1932-04-28 1935-05-14 Aluminum Co Of America Cable
US3089048A (en) * 1960-06-03 1963-05-07 Gen Electric Winding support system for a dynamoelectric machine
US3445703A (en) * 1965-12-06 1969-05-20 Gen Electric Combined cast risers and involuted equalizers
JPS61104748A (ja) 1984-10-29 1986-05-23 Nisshin Flour Milling Co Ltd 高油脂含有食品顆粒
SU1617538A1 (ru) 1988-02-08 1990-12-30 Научно-исследовательский, проектно-конструкторский и технологический институт тяжелого электромашиностроения Харьковского завода "Электротяжмаш" им.В.И.Ленина Ротор электрической машины
EP0736953A2 (de) 1995-04-08 1996-10-09 ABB Management AG Rotor einer elektrischen Maschine
US5635785A (en) * 1995-04-08 1997-06-03 Asea Brown Boveri Ag Rotor of an electric machine with winding overhang support
CN1065679C (zh) 1995-04-08 2001-05-09 亚瑞亚·勃朗勃威力有限公司 一种电机的转子
DE19519127C1 (de) 1995-05-16 1996-09-12 Siemens Ag Dynamoelektrische Maschine mit bewickeltem Rotor
CN1090833C (zh) 1995-05-16 2002-09-11 沃依特·西门子水力发电两和公司 带有绕组转子的电机
US6020670A (en) * 1998-08-17 2000-02-01 General Electric Co. Connector support block for limiting deflection of a main lead connector in an electric machine
JP2000166159A (ja) 1998-11-27 2000-06-16 Kokusan Denki Co Ltd 電動機用固定子
JP2007104847A (ja) 2005-10-07 2007-04-19 Hitachi Ltd 回転電機及びその製作方法
CN101588104A (zh) 2008-05-20 2009-11-25 株式会社日立制作所 旋转电机
US20090289519A1 (en) * 2008-05-20 2009-11-26 Hitachi, Ltd. Electric rotating machine
JP2009284579A (ja) 2008-05-20 2009-12-03 Hitachi Ltd 回転電機
DE102009003798A1 (de) 2009-04-17 2010-10-21 Contitech Antriebssysteme Gmbh Kraftübertragungsriemen, insbesondere Keilriemen, und Verfahren zu dessen Herstellung

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Decision of Grant issued from Russian Patent Office dated Oct. 16, 2015 for RU Application No. 2014130075.
Office action Issued from Canadian Patent Office dated Jan. 4, 2016 for CA Application No. 2,858,282.
State Intellectual Property Office at People's Republic of China Search Report, dated Feb. 1, 2016.

Also Published As

Publication number Publication date
CH705931A1 (de) 2013-06-28
WO2013093000A1 (de) 2013-06-27
EP2795767B1 (de) 2019-07-17
JP2015501131A (ja) 2015-01-08
EP2795767A1 (de) 2014-10-29
CA2858282C (en) 2018-01-09
CN104170217B (zh) 2017-09-08
WO2013093000A4 (de) 2013-09-12
CN104170217A (zh) 2014-11-26
CA2858282A1 (en) 2013-06-27
JP5823061B2 (ja) 2015-11-25
PT2795767T (pt) 2019-10-28
ES2749447T3 (es) 2020-03-20
RU2014130075A (ru) 2016-02-10
US20140292136A1 (en) 2014-10-02

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